Just discovered this great filtering tool to find channels with manually uploaded subtitles (usually more accurate of course)

Check out the site

It does a really deep filtering and organizing of channel options based on countries, subscribers, how many videos actually have manually added subtitles, etc. I've had the problem of finding one or two videos I liked from a channel and then discovered there were no more with accurate manual subs so I felt I wasted my time when I was looking for a new language parent to focus on. This can help save your time with that but also helps you discover new channels.